Styling tweaks to football match pages

A few minor tweaks to football match pages noticed by various people since lanuch of bacon

- Refactor and BEMify match summary markup
- Apply margin right to match score
- Reduce tab font-size and padding at smaller breakpoints
- Change heading style on football nav


#### Before
![google chrome](https://f.cloud.github.com/assets/80089/1290685/01141360-3035-11e3-8f58-9db63adc58a3.png)

#### After
![google chrome](https://f.cloud.github.com/assets/80089/1290686/05c4db1a-3035-11e3-961f-f34077a68330.png)